Damper Piston Friction Ring Structure for Higher Braking Force
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Solution Overview
Problem
The existing damper device struggles to achieve a high braking force due to insufficient deformation of the seal member when the piston moves in the damper braking direction.
Innovation Solution
The damper device includes a piston with an annular groove, a seal ring, and a friction member. When the piston moves in the damper braking direction, the seal ring presses the friction member to expand in diameter, allowing its outer peripheral surface to come into pressure contact with the inner peripheral surface of the cylinder, thereby generating a high frictional force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the slider is brought into pressure contact with the seal member only by frictional force of the tip end portion of the lip, then the structure is simple, but the braking force is insufficient due to inadequate deformation of the seal member
Solution Approach 1:
The sealing structure is divided into two functional components: a seal ring positioned on the damper braking direction side that provides sealing and generates frictional force, and a friction member positioned on the return direction side that is pressed by the seal ring to expand and contact the cylinder inner wall, generating additional braking force through friction
Solution Approach 2:
The friction member is designed to be dynamically deformable, expanding in diameter when pressed by the seal ring during damper braking direction movement, allowing its outer peripheral surface to come into pressure contact with the inner peripheral surface of the cylinder, thereby dynamically adjusting the contact area and friction force based on operational conditions
2Strength
If the friction member is made smaller than the cylinder inner peripheral surface when no pressing force is applied, then the friction member can expand sufficiently when pressed, but the friction member requires additional space for expansion
Solution Approach 1:
The friction member is pre-configured with a smaller diameter than the cylinder inner peripheral surface when no pressing force is applied, preparing it in advance to expand sufficiently when pressed by the seal ring during operation, ensuring optimal contact pressure and friction force generation without requiring excessive space
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for sufficient deformation of the friction member, resulting in a high damper braking force that includes the frictional force of both the seal ring and the friction member against the cylinder's inner surface.
Implementation Method 1
the seal ring presses the friction member to expand the friction member in diameter
Implementation Method 2
an outer peripheral surface of the friction member is configured to be brought into pressure contact with an inner peripheral surface of the cylinder
Data Source
AI summary
A damper device includes: a cylinder; a rod; a piston having an annular groove; a seal ring; and a friction member. A seal portion is formed between the cylinder and the piston. When the piston moves in a damper braking direction, the seal ring is configured to press the friction member to expand the friction member in diameter, and an outer peripheral surface of the friction member is configured to be brought into pressure contact with an inner peripheral surface of the cylinder. The friction member is formed to be smaller than a size of the inner peripheral surface of the cylinder when no pressing force is applied from the seal ring.